Hemlocks are one of the few evergreens that will tolerate deep shade and they are also among the most graceful of the conifers. The Canadian hemlock is the hardiest species. All hemlocks can be planted in the shade of tall deciduous trees, and they also are useful for planting on the north side of buildings. Since they are easily pruned, hemlocks make excellent hedges or screens. They are often used as borders between adjoining land owners.